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Constantan® Coil
Available Configurations
Properties common to all products in this list
| Thickness | Coil Width | Length | Temper ⓘ |
|---|---|---|---|
| 0.005 mm (foil) to 1 mm (sheet) | 1.36 mm to 305 mm | 0.1 m to 2000 m | As rolled Annealed |
Need custom configurations? Please contact us.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Key Features
Constantan® Coil (Cu55/Ni45) is a continuous spooled format of the copper-nickel resistance alloy renowned for its nearly constant electrical resistance across a wide temperature range, supplied for automated winding, coiling, and resistance element fabrication:
Near-Zero Temperature Coefficient of Resistance for Predictable Resistive Performance
With a resistivity of approximately 49 µΩ·cm at 20 °C and a temperature coefficient of resistance close to zero, Constantan® Coil delivers reliable, predictable resistive performance across dynamic temperature environments — the defining property that has made constantan the standard negative leg material in type J and type T thermocouples since the alloy's invention.
Standard Negative Leg Material in Type J & Type T Thermocouples
Constantan's role as the standard negative leg material in type J and type T thermocouples since the alloy's invention reflects its uniquely stable thermoelectric and resistive behavior — properties that the coil format brings to continuous-feed thermocouple wire and resistance element manufacture.
Excellent Ductility & Workability from Face-Centered Cubic Structure
The alloy's face-centered cubic structure provides excellent ductility and workability, supporting continuous-feed winding into precision resistance coils, strain gauge elements, and resistance thermometers without cracking or work-hardening complications during high-volume winding operations.
Consistent Dimensional Quality Across Extended Lengths for Temperature-Compensated Circuits
The coil format ensures consistent dimensional quality and mechanical properties across extended lengths, which is essential for temperature-compensated circuits and long-length resistance coil manufacture, where strip-to-strip or position-dependent property variation would compromise circuit performance.
Reproducible Strip for Resistance Stability & Thermoelectric Research
In research, Constantan® Coil supports investigations into resistance stability, thermoelectric behavior, and precision sensor development across reproducible strip lengths — providing a consistent copper-nickel substrate for systematic experimental programs in precision measurement and sensor technology.
Industrial Applications
Constantan® Coil is used across precision instrumentation, thermocouple manufacture, and sensor research wherever a continuously processed, resistance-stable copper-nickel strip is required:
- ✦ Precision Shunt Resistor Winding
- Used in precision shunt resistor winding, where Constantan® Coil's near-zero temperature coefficient of resistance ensures stable, predictable shunt performance across the operating temperature range encountered in current measurement applications.
- ✦ Resistance Thermometer Coil Fabrication
- Applied in resistance thermometer coil fabrication, where the coil format's continuous-feed winding capability and the alloy's excellent ductility support efficient, high-volume production of precision resistance thermometer elements.
- ✦ Continuous-Feed Strain Gauge Production
- Used in continuous-feed strain gauge production, where Constantan® Coil's predictable, stable resistive behavior provides the foundation for accurate strain measurement elements manufactured at scale from continuous coil stock.
- ✦ Type J & Type T Thermocouple Manufacture
- Used in type J and type T thermocouple manufacture, where constantan's established role as the standard negative leg material — combined with the coil format's suitability for continuous-feed wire production — supports high-volume thermocouple wire fabrication with consistent thermoelectric performance.
- ✦ Resistance Stability, Thermoelectric Behavior & Precision Sensor Development Research
- Used in research to support investigations into resistance stability, thermoelectric behavior, and precision sensor development across reproducible strip lengths — providing a consistent substrate for systematic studies in precision measurement and sensor technology development.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 100-300 |
| Elongation at break( % ) | 45 |
| Modulus of elasticity( GPa ) | 162 |
| Izod impact strength( J m⁻¹ ) | 107 |
| Tensile strength( MPa ) | 400-590 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 52 |
| Temperature coefficient( K⁻¹ ) | 0.00002+/- |
| Element | Value |
|---|---|
| Maximum use temperature in air( C ) | 500 |
| Melting point( C ) | 1225-1300 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 19.5@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 14.9@20-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.9 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Coil Width | <100mm | ±1mm |
| Coil Width | >=100mm | +2% / -1% |
| Length | +10% / -0% |